1. do something risky in the hopes of achieving something positive
take a chance/gamble on someone
'To gamble' is to play a game with the hope of winning money or to act in a risky way in the hope of achieving success. When you 'take a gamble' it means to spend or invest money with the hope of making a profit, in this way it means to take a risk. 'To take a chance' has a similar meaning to behave in a way which involves a risk or a possibility of danger or failure. You can take a chance on a person, meaning to put your trust or faith in them with the awareness that it might be risky or that they could disappoint you. If you tell someone you are taking a chance or taking a gamble you are letting them know that the result is not certain or safe.